Dorothy Mengering, the mother of former late night host David Letterman, has died at the age of 95.Mengering died Tuesday at her home in Carmel, Indiana, just one day before Letterman's 70th birthday. Mengering was a frequent guest on her son's late night programs, making her first appearance on 'Late Night with David Letterman' in 1986. She continued to make pop up on the 'Late Show' when Letterman took over in 1993.Mengering attributed her popularity on the program's to a simple concept. "People enjoy seeing a mother and son together. It's that simple” the Indiana native wrote in her 1996 cookbook, 'Home Cookin’ with Dave’s Mom.'Current 'Late Show' host Stephen Colbert tweeted his condolences after news broke of Mengering's death. "I'm so sorry to hear of Dorothy Mengering's death, and so grateful that Dave shared her with us," Colbert said.

Dorothy Mengering, the mother of former late night host David Letterman, has died at the age of 95.

Mengering died Tuesday at her home in Carmel, Indiana, just one day before Letterman's 70th birthday.

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Mengering was a frequent guest on her son's late night programs, making her first appearance on 'Late Night with David Letterman' in 1986. She continued to make pop up on the 'Late Show' when Letterman took over in 1993.

Mengering attributed her popularity on the program's to a simple concept.

"People enjoy seeing a mother and son together. It's that simple” the Indiana native wrote in her 1996 cookbook, 'Home Cookin’ with Dave’s Mom.'